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| Abstract No.: |
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Scheduled at:
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Friday, June 09, 2017, Hall 28 2:20 PM
Cold Gas Spraying IV
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| Title: |
Residual stress and mechanical properties of cold-sprayed inconel 718 for repair of aero engine components
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| Authors: |
Reeti Singh* / Forschungszentrum Jülich GmbH, Germany
Susanne Schrüfer / Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany
Scott Wilson/ Oerlikon Metco AG, Rigackerstrasse 16, CH-5610 Wohlen, Switzerland, Switzerland
Robert Vaßen/ Institute of Energy and Climate Research (IEK-1), Forschungszentrum-Jülich, 52428-Jülich, Germany, Germany
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| Abstract: |
In the cold spray process, deposition of particles takes place through intensive plastic deformation upon impact in a solid state at the temperatures well below their melting point. The high particle impact velocity causes high local stresses which lead to deform the particles and the substrate plastically in the proximity of the particlesubstrate interface. As a result, high residual stresses are introduced in cold spray coating due to the peening effect of the particles collisions with the substrate. The amount and type of residual stress (compressive or tensile) confer appreciable or depreciable characteristics to the mechanical properties of the coatings. In this study, Inconel 718 powder particles were cold-sprayed on Inconel 718 substrates by using nitrogen gas for an application as repair tool for aero engine components. Magnitude of the residual stress and its distribution through the thickness were measured by using the hole-drilling and the curvature methods. Mainly compressive stresses were observed in cold-sprayed Inconel 718 coatings. An investigation of mechanical properties of Inconel coatings e.g. Vickers-hardness, bond-strength, wear resistance and the fatigue life was carried out. Observation of fractured surfaces was used to investigate the failure mechanism of the coatings. It has been observed that the mechanical properties of cold-sprayed Inconel 718 coatings are highly influenced by the substrate-interface properties and residual stress states.
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